Using scissors to cut out small squares of paper that will fit snugly on each side of the blocks.
You can also use letter stickers or shapes if you desire to make an ‘alphabet’ block. I used two letters on each block and covered the other four sides with pretty paper.
Paint each block with one to two coats of paint. Allow the paint to dry.
Brush a coat of Mod Podge on one side of a block and press either a paper square or letter shape over the glue. Smooth out any bubbles and allow to dry. Repeat this step with the other blocks.
Cover the sides of each block, working in stages as each side dries. Let dry completely before displaying.
Notes
Mod Podge is non-toxic and water based, so it is safe for children to handle and to craft with - however, children should not put these blocks in their mouths.